I don't know why Crunch is so surprised about the age being 11 for first exposure.

Before the internet (and yes, I am that old) we only had magazines, and later videos, but I seem to recall having my first couple of magazines at around 11 or 12, so in real terms, internet porn at 11 seems a bit late to me!

As for the rest of the stats here, i think the saying goes as "...there are lies, damn lies, and statistics..." and you can claim anything you like, so long as it looks reasonable people will believe it.